Malicious PDF — malware analysis report

Static analysis result for SHA-256 5368d6c659cb0b6e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 15:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b585947075834da89b04ad3c3a454577 SHA-1: dd0b17fa0e91c14c92aa1a413682151854bfa981 SHA-256: 5368d6c659cb0b6e9883cb941b99f2d90f623ad508504ac3f8c0f281fe28761c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://felixefontesadvogados.com.br/ckfinder/userfiles/files/9425046984.pdf In PDF document text
    • https://4of100churchstreet.com/assets/media/files/vanuv.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ecf17a5d77e58543c3a536c148f6867d/40546731549.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161412b3e41195---69734235782.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908102533.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/22432658296.pdfIn PDF document text
    • http://industrialdevices.in/uploads/2971917387.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/83548425199.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/86150149196.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/738188414.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/jedudigazoxu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zupetubakolatazevesu.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/4628904171.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b91c9ebcb---78064056220.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/kefipepomiko.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/15889045632.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/gewekawexix.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b69c412c---xojonasasaj.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462a749da40---56695468186.pdfIn PDF document text
    • https://maisonforville.be/documents/file/12226092686.pdfIn PDF document text
    • https://kimcert.net/E/file/zapikikalimaruwi.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/88513138293.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/wuremewupanare.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/21081646776.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c91a25a1e---tudafovodenezi.pdfIn PDF document text
    • http://ativn.com/upload/file/lebibuparebexasekog.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/tetevizajefurosabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=grand+theft+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01B 19944 bytes
SHA-256: a43052d82a4624ad225018f341b82ae923976429c554fc5e1cc65b407f69e664
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 10276 bytes
SHA-256: 71c422cc1d343bc38a4a51bfbad9e086800041dae00737109cff42ee954f337c
font_02_sfnt_off00011a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1